(19)
(11) EP 1 536 667 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
26.10.2016 Bulletin 2016/43

(43) Date of publication A2:
01.06.2005 Bulletin 2005/22

(21) Application number: 04257271.9

(22) Date of filing: 24.11.2004
(51) International Patent Classification (IPC): 
H04S 1/00(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LU MC NL PL PT RO SE SI SK TR
Designated Extension States:
AL HR LT LV MK YU

(30) Priority: 28.11.2003 JP 2003400178

(71) Applicant: Sony Corporation
Tokyo 141-0001 (JP)

(72) Inventors:
  • Yamada, Yuji, c/o Sony Corporation
    Tokyo 141-0001 (JP)
  • Okimoto, Koyuru, c/o Sony Corporation
    Tokyo 141-0001 (JP)

(74) Representative: Smith, Samuel Leonard 
J A Kemp 14 South Square
Gray's Inn London WC1R 5JJ
Gray's Inn London WC1R 5JJ (GB)

   


(54) Digital signal processing apparatus, method thereof and headphone apparatus


(57) In the digital signal processing apparatus, the first digital filter reproduces that part of an impulse response which responds fast, and the decimation filter converts the output of the delay device of the first digital filter to a digital signal having a sampling rate of, for example, 1/2. The digital signal is supplied to the second digital filter. The second digital filter reproduces that part of the impulse response, which responds slowly and outputs data representing the response characteristic of this part of the impulse response. The interpolation filter converts an input signal to a signal having the same sampling rate as the digital audio signal input to the digital signal processing apparatus. The output signal of the interpolation filter is supplied to the adder circuit.







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